:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --sidebar: #152033;
  --sidebar-text: #c5d0e0;
  --sidebar-active: #ffffff;
  --accent: #1f4b7a;
  --accent-soft: #e8eef5;
  --border: #e2e8f0;
  --text: #1a2332;
  --muted: #64748b;
  --danger: #b42318;
  --success: #067647;
  --warning: #b54708;
  --info: #175cd3;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  --font: "DM Sans", "Segoe UI", sans-serif;
  --font-display: "Source Serif 4", Georgia, serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 0% 0%, #e7eef7 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #edf2f7 0%, transparent 50%),
    var(--bg);
}

button, input, select, textarea { font: inherit; }
a { color: var(--accent); }

.app { display: flex; min-height: 100vh; }

.sidebar {
  width: 240px;
  background: linear-gradient(180deg, #152033 0%, #1b2a44 100%);
  color: var(--sidebar-text);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  flex-shrink: 0;
}
.brand {
  padding: 0 .5rem;
}
.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: #fff;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.brand small { color: #8ea0b8; font-size: .75rem; }
.nav { display: flex; flex-direction: column; gap: .25rem; }
.nav button {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  padding: .7rem .85rem;
  border-radius: 8px;
  cursor: pointer;
}
.nav button:hover { background: rgba(255,255,255,.06); color: #fff; }
.nav button.active { background: rgba(255,255,255,.12); color: var(--sidebar-active); font-weight: 600; }
.sidebar-foot { margin-top: auto; padding: .5rem; font-size: .8rem; color: #8ea0b8; }

.main { flex: 1; padding: 1.5rem 1.75rem 2.5rem; min-width: 0; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.topbar h2 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}
.topbar .actions { display: flex; gap: .5rem; flex-wrap: wrap; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.2rem;
}
.card + .card { margin-top: 1rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; }

.stat h3 { margin: 0; font-size: .8rem; color: var(--muted); font-weight: 500; }
.stat .value { margin-top: .35rem; font-size: 1.4rem; font-weight: 700; letter-spacing: -0.02em; }

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  padding: .55rem .9rem;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 550;
}
.btn:hover { background: #f8fafc; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.05); background: var(--accent); }
.btn-danger { background: #fff; border-color: #fecdca; color: var(--danger); }
.btn-ghost { background: transparent; }
.btn-sm { padding: .35rem .6rem; font-size: .85rem; }

.tabs { display: flex; gap: .35rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border); }
.tabs button {
  border: 0; background: transparent; padding: .75rem 1rem; cursor: pointer; color: var(--muted); font-weight: 550;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); }

label { display: block; font-size: .8rem; color: var(--muted); margin-bottom: .3rem; font-weight: 500; }
.field { margin-bottom: .85rem; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .55rem .7rem;
  background: #fff;
}
.field textarea { min-height: 80px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}
.row { display: flex; gap: .75rem; flex-wrap: wrap; }
.row .field { flex: 1; min-width: 140px; }
.hint { font-size: .78rem; color: var(--muted); margin-top: .25rem; }
.warn { background: #fffaeb; border: 1px solid #fedf89; color: #93370d; padding: .75rem 1rem; border-radius: 8px; margin-bottom: 1rem; font-size: .9rem; }
.error-box { background: #fef3f2; border: 1px solid #fecdca; color: #912018; padding: .75rem 1rem; border-radius: 8px; margin-bottom: 1rem; }

table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
}
table.data th, table.data td {
  text-align: left;
  padding: .7rem .6rem;
  border-bottom: 1px solid var(--border);
}
table.data th { color: var(--muted); font-weight: 550; font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; }
table.data tr:hover td { background: #fafbfc; }
table.data tr.clickable { cursor: pointer; }

.badge {
  display: inline-flex;
  align-items: center;
  padding: .15rem .5rem;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 650;
}
.badge-draft { background: #f2f4f7; color: #344054; }
.badge-issued { background: #eff8ff; color: var(--info); }
.badge-paid { background: #ecfdf3; color: var(--success); }
.badge-overdue { background: #fef3f2; color: var(--danger); }
.badge-void { background: #f2f4f7; color: #667085; }

.toolbar { display: flex; gap: .6rem; flex-wrap: wrap; margin-bottom: 1rem; align-items: end; }
.toolbar .field { margin: 0; min-width: 160px; }

.lines-table input, .lines-table select { width: 100%; padding: .4rem; border: 1px solid var(--border); border-radius: 6px; }
.lines-table td { vertical-align: top; }
.totals-box {
  margin-left: auto;
  width: min(320px, 100%);
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .9rem 1rem;
}
.totals-box .line { display: flex; justify-content: space-between; margin: .3rem 0; font-size: .92rem; }
.totals-box .grand { margin-top: .5rem; padding-top: .5rem; border-top: 1px solid var(--border); font-weight: 700; font-size: 1.05rem; }

.modal-backdrop {
  position: fixed; inset: 0; background: rgba(15, 23, 42, .45);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 2rem 1rem; z-index: 50; overflow: auto;
}
.modal {
  background: #fff; border-radius: 12px; width: min(920px, 100%);
  box-shadow: 0 20px 50px rgba(0,0,0,.2); padding: 1.25rem;
}
.modal-header { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.modal-header h3 { margin: 0; }

.login-wrap {
  min-height: 100vh; display: grid; place-items: center; padding: 1.5rem;
  background:
    linear-gradient(145deg, #152033 0%, #1f4b7a 55%, #2a6aa8 100%);
}
.login-card {
  width: min(400px, 100%);
  background: #fff;
  border-radius: 14px;
  padding: 2rem;
  box-shadow: 0 25px 60px rgba(0,0,0,.25);
}
.login-card h1 {
  margin: 0 0 .25rem;
  font-family: var(--font-display);
  font-size: 1.6rem;
}
.login-card p { color: var(--muted); margin: 0 0 1.25rem; }

.hidden { display: none !important; }
.toast {
  position: fixed; bottom: 1.25rem; right: 1.25rem; z-index: 100;
  background: #101828; color: #fff; padding: .75rem 1rem; border-radius: 8px;
  box-shadow: var(--shadow); max-width: 360px; font-size: .9rem;
}

.invoice-sheet {
  background: #fff;
  color: #111;
  width: 210mm;
  min-height: 297mm;
  margin: 0 auto;
  padding: 14mm 14mm 16mm;
  position: relative;
  font-size: 11pt;
  line-height: 1.35;
  box-sizing: border-box;
}
/* Forzar A4 en captura PDF (anula media queries responsive) */
.invoice-sheet.invoice-sheet--pdf {
  width: 794px !important;
  max-width: 794px !important;
  min-height: 1123px !important;
  padding: 48px !important;
  margin: 0 !important;
  font-family: Helvetica, Arial, sans-serif !important;
}
.invoice-sheet .watermark {
  position: absolute; inset: 0; display: grid; place-items: center;
  pointer-events: none; z-index: 1;
  font-size: 64pt; font-weight: 700; color: rgba(100,116,139,.18);
  transform: rotate(-28deg); letter-spacing: .1em;
}
.inv-header { display: flex; justify-content: space-between; gap: 1.5rem; margin-bottom: 1.5rem; position: relative; z-index: 2; }
.inv-logo img { max-height: 56px; width: auto; object-fit: contain; display: block; }
.inv-logo.size-small img { max-height: 40px; }
.inv-logo.size-large img { max-height: 80px; }
.inv-header.pos-center { flex-direction: column; align-items: center; text-align: center; }
.inv-header.pos-right { flex-direction: row-reverse; }
.inv-meta { text-align: right; }
.inv-meta h2 { margin: 0 0 .5rem; font-size: 1.4rem; }
.inv-block { margin-bottom: 1.25rem; position: relative; z-index: 2; }
.inv-block h4 { margin: 0 0 .4rem; font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; }
.inv-table { width: 100%; border-collapse: collapse; margin: 1rem 0; position: relative; z-index: 2; }
.inv-table th { color: #fff; text-align: left; padding: .5rem; font-size: .8rem; }
.inv-table td { padding: .5rem; border-bottom: 1px solid #e5e7eb; vertical-align: top; }
.inv-totals { width: 260px; margin-left: auto; position: relative; z-index: 2; }
.inv-totals .line { display: flex; justify-content: space-between; padding: .25rem 0; }
.inv-footer { margin-top: 2rem; font-size: .85rem; color: #475467; border-top: 1px solid #e5e7eb; padding-top: .75rem; position: relative; z-index: 2; }
.legend { font-size: .85rem; color: #344054; margin: .35rem 0; }

.chart-bars { display: flex; align-items: flex-end; gap: .5rem; height: 180px; padding-top: 1rem; }
.chart-bars .bar-group { flex: 1; display: flex; flex-direction: column; align-items: center; gap: .35rem; height: 100%; justify-content: flex-end; }
.chart-bars .bars { display: flex; align-items: flex-end; gap: 3px; height: 100%; width: 100%; justify-content: center; }
.chart-bars .bar { width: 14px; border-radius: 4px 4px 0 0; min-height: 2px; }
.chart-bars .bar.billed { background: var(--accent); }
.chart-bars .bar.collected { background: #67a38a; }
.chart-bars .lbl { font-size: .68rem; color: var(--muted); }

.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  text-align: center;
  color: var(--muted);
  background: #fafbfc;
  cursor: pointer;
}
.dropzone.drag { border-color: var(--accent); background: var(--accent-soft); }
.logo-preview { max-height: 80px; margin: .75rem 0; }

@media (max-width: 960px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; flex-wrap: wrap; align-items: center; gap: .75rem; padding: 1rem; }
  .nav { flex-direction: row; flex-wrap: wrap; }
  .sidebar-foot { display: none; }
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr 1fr; }
  .invoice-sheet { width: 100%; min-height: auto; padding: 1rem; }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
  .main { padding: 1rem; }
}

@media print {
  body * { visibility: hidden; }
  .invoice-sheet, .invoice-sheet * { visibility: visible; }
  .invoice-sheet {
    position: absolute; left: 0; top: 0; width: 210mm; box-shadow: none; margin: 0;
  }
  .no-print { display: none !important; }
}